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Statements of Stockholders' Equity - USD ($)
Class A Common Stock
Class C Common Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Income
Retained Earnings
Treasury Stock
Total
Balance at Dec. 31, 2016 $ 27,638,012 $ 3,804,458 $ 34,813,246 $ 264,822 $ 67,409,204 $ (1,370,611) $ 132,559,131
Net earnings         4,345,864   4,345,864
Other comprehensive income (loss)       (22,609)     (22,609)
Grant of stock options     203,312       203,312
Exercise of stock options 2 206,804 (206,806)        
Sale of treasury stock     373,385     351,157 724,542
Purchase of treasury stock           (185,470) (185,470)
Stock Dividends 930 4 2,350   (3,284)    
Conversion Class C to Class A 1,214 (1,214)          
Balance at Jun. 30, 2017 27,640,158 4,010,052 35,185,487 242,213 71,751,784 (1,204,924) 137,624,770
Balance at Dec. 31, 2017 29,071,154 4,178,748 38,125,042 603,170 77,520,951 (931,075) 148,567,990
Cumulative effect adjustment upon adoption of new accounting standard (ASU 2016-01)       (603,170) 603,170    
Net earnings         20,164,140   20,164,140
Other comprehensive income (loss)       (1,448)     (1,448)
Grant of stock options     116,140       116,140
Exercise of stock options 63,968   (22,115)       41,853
Sale of treasury stock     252,299     444,830 697,129
Stock Dividends 3,520 (4) 5,362   (8,878)    
Conversion Class C to Class A 376 (376)          
Balance at Jun. 30, 2018 $ 29,139,018 $ 4,178,368 $ 38,476,728 $ (1,448) $ 98,279,383 $ (486,245) $ 169,585,804